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  1. #1
    Join Date
    Feb 2010
    Location
    Long Beach, CA
    Posts
    105

    Default Domestic water supply system & Pressure Relief Valve

    A pressure relief valve (or expansion tank) is required if the home has a pressure regulator or other device that closes the loop...does the pressure relief valve at the tankless water heater meet that requirement or must another PRV be installed at an exterior location?


    Thanks

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  2. #2
    Join Date
    Dec 2007
    Location
    Holladay, UT
    Posts
    565

    Default Re: Domestic water supply system & Pressure Relief Valve

    Two different beasts Marc. Here is some good info on expansion devices. I almost always see them installed just above water heater on the cold water supply line. Their main job is to protect against thermal expansion as water is heated. Hope this helped. Thermal Expansion - Learn About - Watts
    or http://www.aohomeinspection.com/pdf/...on-control.pdf

    Tom Rees / A Closer Look Home Inspection / Salt Lake City, Utah

  3. #3
    Daniel Mack's Avatar
    Daniel Mack Guest

    Default Re: Domestic water supply system & Pressure Relief Valve

    Quote Originally Posted by Tom Rees View Post
    Two different beasts Marc. Here is some good info on expansion devices. I almost always see them installed just above water heater on the cold water supply line. Their main job is to protect against thermal expansion as water is heated. Hope this helped. Thermal Expansion - Learn About - Watts
    or http://www.aohomeinspection.com/pdf/...on-control.pdf
    Excellent information source. Thanks!


  4. #4
    Loren Sanders Sr.'s Avatar
    Loren Sanders Sr. Guest

    Default Re: Domestic water supply system & Pressure Relief Valve

    Quote Originally Posted by Tom Rees View Post
    Two different beasts Marc. Here is some good info on expansion devices. I almost always see them installed just above water heater on the cold water supply line. Their main job is to protect against thermal expansion as water is heated. Hope this helped. Thermal Expansion - Learn About - Watts
    or http://www.aohomeinspection.com/pdf/...on-control.pdf
    My water district states that only older water meters contain check valves built in to the meter...he indicated older as 25 to 30 years old homes.


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